When you fillet multiple objects at once and one of the objects has an error all fillets go wrong. is there a way too avoid that? It’s not always clear which object causes the error, which forces you to do one by one. Probably I am missing something Thanks!

Hello -if you are in FilletEdge, the best way, I guess, is to a) look for handles that draw in red when still in the command - those will point out possible trouble spots - radius too large, and b) use the Preview option to see what Rhino is thinking about building. After the fact if you Undo and run the command again, you can choose PreviousEdgeSelection to see, possibly, using the above, what may have gone wrong.